[automerger skipped] SurfaceComposerClient: add a range check in setAlpha am:...

[automerger skipped] SurfaceComposerClient: add a range check in setAlpha am: f4bd36b7 am: 16724c2c -s ours am: e85d1912 -s ours

am skip reason: Merged-In I172321a4d3533e0506bad75a0a91e33fe921c2b7 with SHA-1 ff930b40 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/22434167



Change-Id: Ic04e1f8e57831c018e50bef0b91fab83617535ca
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>